name = "ada lovelace"
print(name.title())
print(name.upper())
print(name.lower())
def say():
    '''say hell owrld'''
    print("hello owrld")

first_name = "wang"
last_name = "xu"
full_name = first_name + last_name
print('hello,' + full_name + "!")
print("---------------------------------")
favorite_language = "python "
print(favorite_language)
favorite_language = "  python  "
print("---------------------------------")
print(favorite_language.rstrip() + "删除末尾的空格") # 删除末尾的空格
print("---------------------------------")
print(favorite_language.lstrip() + "删除开始空格") # 删开始空格
print("---------------------------------")
print(favorite_language.strip() + "同时删除开始和末尾的空格") # 同时删除开始和末尾的空格
print("---------------------------------")


a = 0.1 + 0.2
print(a)
